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#pragma once
#include "caffe2/core/context.h"
#include "caffe2/core/operator.h"
namespace caffe2 {
// RecordShapeOp records the shape of the input tensor to a vector of int. You
// mostly don't need this operator explicitly, and it is mostly used in the
// autodiff process.
template <class Context>
class ShapeOp : public Operator<Context> {
public:
USE_OPERATOR_CONTEXT_FUNCTIONS;
template <class... Args>
explicit ShapeOp(Args&&... args)
: Operator<Context>(std::forward<Args>(args)...),
axes_(OperatorBase ::GetRepeatedArgument<int>("axes")) {}
bool RunOnDevice() override {
auto& data = Input(DATA);
int numDims = data.dim();
int numAxes = axes_.size();
if (numAxes == 0) {
auto* output = Output(0, {numDims}, at::dtype<int64_t>());
int64_t* output_data = output->template mutable_data<int64_t>();
context_.CopyBytesSameDevice(
numDims * sizeof(int64_t), data.sizes().data(), output_data);
return true;
}
auto* output = Output(0, {numAxes}, at::dtype<int64_t>());
auto src = reinterpret_cast<const char*>(data.sizes().data());
auto out = reinterpret_cast<char*>(output->template mutable_data<int64_t>());
for (int i = 0; i < numAxes; i++) {
auto axis = axes_[i];
CAFFE_ENFORCE_LT(axis, numDims, "Axis out of range");
CAFFE_ENFORCE_GE(axis, 0, "Each axis should be non-negative");
context_.CopyBytesSameDevice(
sizeof(int64_t), src + axis * sizeof(int64_t), out);
out += sizeof(int64_t);
}
return true;
}
INPUT_TAGS(DATA);
private:
vector<int> axes_;
};
} // namespace caffe2
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